CN101463770A - Exhaust purification apparatus for engine - Google Patents

Exhaust purification apparatus for engine Download PDF

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Publication number
CN101463770A
CN101463770A CNA2008101864782A CN200810186478A CN101463770A CN 101463770 A CN101463770 A CN 101463770A CN A2008101864782 A CNA2008101864782 A CN A2008101864782A CN 200810186478 A CN200810186478 A CN 200810186478A CN 101463770 A CN101463770 A CN 101463770A
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mentioned
nox
exhaust gas
motor
exhaust
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CN101463770B (en
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铃木享
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Mitsubishi Fuso Truck and Bus Corp
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Mitsubishi Fuso Truck and Bus Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
    • F02D41/1462—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F02D41/1463—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F02D41/1463—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus
    • F02D41/1465—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus with determination means using an estimation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1621—Catalyst conversion efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/36—Control for minimising NOx emissions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The present invention provides an exhaust purification apparatus for an engine, when the temperature of a SCR catalyst (40) is reduced, an ECU (51) calculates a purification rate deviation ratio R, on the basis of a target exhaust purification rate (Eta tgt) obtained based on a operational state of the engine (1) and estimation exhaust pufification rate (Eta) representing the catalyst temperature (Tcat). In addition, the ECU (51) calculates target NOx decrease parameter (Ktgt) that may compensate the decrease of NOx exhaust purification ratio caused by temperature decrease, by multiplying the purification rate deviation ratio R by a NOx decrease parameter (K) calculated based on the air input O2 concentration, and implements EGR control based on the air input O2 concentration corresponding with the target NOx decrease parameter (Ktgt).

Description

The Exhaust gas purifying device of motor
Technical field
The present invention relates to the Exhaust gas purifying device of motor, specifically, relate in the exhaust passageway of motor, the Exhaust gas purifying device of the selective reduction type NOx catalyzer that is reducing agent and the NOx that contains in the selective reduction exhaust is set with ammonia.
Background technique
Be arranged in the exhaust passageway of motor and the NOx catalyzer of the NOx that contains in the selective reduction exhaust, as the equipment exhaust that is used for purifying engine and by known.Using under the situation of this selective reduction type NOx catalyzer, spraying urea water from the jet blower of the NOx catalyzer upstream side that is disposed at exhaust passageway.The urea water that ejects is utilized the water vapor in heat of exhaust and the exhaust and is added water decomposition, generates ammonia (NH 3).By utilizing the ammonia (NH of such generation 3) as reducing agent, the NOx in the NOx catalyzer in the selective reduction exhaust.
For selective reduction type NOx catalyzer is brought into play well by NOx is carried out the exhaust purification performance that selective reduction brings, then must be with the temperature maintenance of selective reduction type NOx catalyzer more than or equal to active temperature (for example more than or equal to 200 ℃).But according to the environmental conditions of lower cold area of the vehicle driving condition of for example traffic congestion in the urban district etc. etc. or outside air temperature etc., the temperature of NOx catalyzer can be lower than active temperature sometimes.In this low-temperature region, exist the NOx catalyzer sharply to reduce, the problem that the NOx discharge capacity in atmosphere increases for the exhaust gas purification rate of NOx.
Be conceived to the problems referred to above, open 2004-No. 239109 communiques (hereinafter referred to as patent documentation 1) according to for example spy of Japan, propose also to keep well when a kind of temperature at the NOx catalyzer reduces by NOx being carried out the countermeasure of the exhaust purification performance that selective reduction brings.
According to the technology of patent documentation 1 record, in the relief opening of each cylinder of diesel engine, pre-oxidation catalyst is set.With exhaust passageway that each relief opening is connected in, begin to dispose successively the jet blower of urea water, preselected reduced form NOx catalyzer, main separation from upstream side and select reduced form NOx catalyzer, main oxidation catalyst.The part that pre-oxidation catalyst plays the NO in the exhaust is oxidized to NO 2Function, the oxidation reaction of this NO also can take place even delivery temperature is low.The NO of Sheng Chenging like this 2,, select reduced form NOx catalyst supply to preselected reduced form NOx catalyzer and main separation and give, by in two kinds of NOx catalyzer, using this NO with the ammonia that generates by urea water 2, obtain this exhaust gas purification effect of selective reduction NOx.
In the technology of patent documentation 1 record, by utilizing the NO that generates by pre-oxidation catalyst 2, compare with existing situation, can obtain to begin the effect of the exhaust gas purification of selective reduction NOx from lower temperature province.But in this case, it is that the situation of low temperature does not change that preselected reduced form NOx catalyzer and main separation are selected reduced form NOx catalyzer.Therefore, shown in the situation of patent documentation 1 record, the lower limit that obtains the temperature province of this exhaust gas purification effect of selective reduction NOx can only be extended to about 180 ℃, in low-temperature region, can not improve this exhaust emission control function significantly.
In addition, in the technology of patent documentation 1 record, in order to generate NO 2, must in the relief opening of each cylinder of motor, dispose pre-oxidation catalyst respectively.Therefore, the technology of patent documentation 1 record exists makes that the structure of Exhaust gas purifying device is complicated greatly, certainly leads to the problem that manufacture cost is increased.
Summary of the invention
The present invention proposes in order to address the above problem a little, its purpose is to provide a kind of Exhaust gas purifying device of motor, and it can prevent in advance because of installing the increase of the complicated manufacture cost that causes, and, in low-temperature region, also can realize exhaust purification performance well for NOx.
To achieve these goals, the Exhaust gas purifying device of motor of the present invention, it has: selective reduction type NOx catalyzer, it is configured in the exhaust passageway of motor, with ammonia as reducing agent, the NOx that selective reduction contains in the exhaust of above-mentioned motor; And the EGR unit, it makes the air inlet side of the exhaust gas recirculation of above-mentioned motor to above-mentioned motor, and it is characterized in that also having: the exhaust gas purification rate is inferred the unit, and it infers the exhaust gas purification rate of above-mentioned NOx catalyzer for NOx; Target exhaust purification ratio computing unit, it calculates the target exhaust purification ratio for NOx according to the operating condition of above-mentioned motor; And control unit, it controls above-mentioned EGR unit, to compensate above-mentioned decrease of inferring the exhaust gas purification rate with respect to above-mentioned target exhaust purification ratio.
Therefore, if reduce, then reflect this situation and infer the purification ratio for NOx of inferring the unit by the exhaust gas purification rate and also reduce owing to the temperature of NOx catalyzer reduces the exhaust gas purification rate that makes for NOx.Therefore, for the exhaust gas purification rate of inferring of NOx, become and be lower than corresponding and be set at the target exhaust purification ratio of optimum value with the operating condition of motor.Control unit is controlled the EGR unit, with the value of compensation with respect to the exhaust gas purification rate of the inferring reduction of this target exhaust purification ratio.Therefore, the increase of the EGR gas flow of air inlet side that can be by being back to motor suppresses the combustion temperature in the cylinder.Its result can reduce the NOx discharge capacity from cylinder, also can realize sufficient purifying property for NOx at low-temperature region.In addition, because utilize existing EGR unit, compensation NOx catalyzer is for the reduction of the exhaust gas purification rate of NOx, so can prevent the complicated of locking apparatus in advance.
In the Exhaust gas purifying device of above-mentioned motor, also can preferred above-mentioned control unit, amount with the exhaust of the above-mentioned motor that utilizes above-mentioned EGR unit to reflux is restricted to the set upper limit amount that is less than or equal to, to become the excess air ratio that can suppress the smog of discharging from above-mentioned motor.
When corresponding for the reduction of the exhaust gas purification rate of NOx with the NOx catalyzer, when the EGR gas flow was increased, the excess air ratio in the cylinder excessively reduced, and may become the main cause that increases from the smog of motor discharge.But under the situation of the Exhaust gas purifying device that constitutes motor like this, in order to suppress smog, control unit is restricted to the EGR gas flow below the set upper limit amount.Its result can prevent to follow the excessive reduction of the excess air ratio in the cylinder in advance and smog increases.
Specifically, the Exhaust gas purifying device of above-mentioned motor also has the oxygen concentration detection unit, it detects the oxygen concentration of the air inlet of supplying with in the cylinder of described motor, above-mentioned control unit has: NOx reduces coefficient calculation unit, its basis is with respect to the NOx formation characteristic in the cylinder of the above-mentioned motor of the oxygen concentration of above-mentioned air inlet, calculate and reduce coefficient, as the index of the minimizing state that is illustrated in the NOx production rate in the cylinder that utilizes above-mentioned motor under the detected oxygen concentration of above-mentioned oxygen concentration detection unit; The aimed oxygen concn computing unit, it is according to inferred the exhaust gas purification rate of inferring out the unit ratio with above-mentioned target exhaust purification ratio by above-mentioned exhaust gas purification rate, proofread and correct above-mentioned NOx and reduce coefficient, according to above-mentioned NOx formation characteristic, above-mentioned NOx after calculating and proofreading and correct reduces the corresponding oxygen concentration of coefficient, as aimed oxygen concn; And the EGR control unit, it controls above-mentioned EGR unit according to the aimed oxygen concn that is calculated by above-mentioned aimed oxygen concn computing unit.
As mentioned above, if reduce, then reflect this situation and infer the exhaust gas purification rate of inferring the unit by the exhaust gas purification rate and also reduce because of the reduction of NOx catalyst temperature makes the exhaust gas purification rate for NOx.Therefore, inferring the exhaust gas purification rate becomes and is lower than corresponding with the operating condition of motor and is set to the value of the target exhaust purification ratio of optimum value.Therefore, infer the ratio of exhaust gas purification rate and target exhaust purification ratio, can be considered as representing the NOx catalyzer being improved what index for the exhaust gas purification rate of NOx.On the other hand, corresponding with the intake-air oxygen concentration in the cylinder of motor, the NOx production rate in the cylinder according to the rules the NOx formation characteristic and change.According to this NOx formation characteristic, NOx reduces coefficient calculation unit and calculates and reduce coefficient, as the index of the minimizing state of the NOx production rate in the cylinder of motor under the oxygen concentration that is illustrated in air inlet.The aimed oxygen concn computing unit reduces coefficient according to inferring the ratio of exhaust gas purification rate with the target exhaust purification ratio, proofread and correct the NOx that calculates in the manner described above.In addition, aimed oxygen concn is calculated the unit according to above-mentioned NOx formation characteristic, and the NOx after calculating and proofreading and correct reduces the corresponding oxygen concentration of coefficient as aimed oxygen concn, and the EGR control unit is according to this aimed oxygen concn control EGR unit.Therefore, the increase of the EGR gas flow of air inlet side that can be by being back to motor suppresses the combustion temperature in the cylinder.Its result can reduce the NOx discharge capacity from cylinder, also can realize sufficient purifying property for NOx at low-temperature region.
The Exhaust gas purifying device of above-mentioned motor, preferably also has the degradation judgment unit, it judges the degradation mode of above-mentioned NOx catalyzer, above-mentioned aimed oxygen concn computing unit, degradation mode according to the above-mentioned NOx catalyzer that determines by above-mentioned degradation judgment unit, correction is inferred the exhaust gas purification rate of inferring out the unit by above-mentioned exhaust gas purification rate, and the exhaust gas purification rate of inferring after proofreading and correct is used for the correction that above-mentioned NOx reduces coefficient.
Under the situation of the Exhaust gas purifying device that constitutes motor in this manner, proofread and correct NOx according to the exhaust gas purification rate of inferring of the degradation mode that reflects the NOx catalyzer and reduce coefficient.The EGR control unit is according to reducing the corresponding aimed oxygen concn of coefficient with the NOx that proofreaies and correct in this manner, control EGR unit.Its result under the state of NOx deterioration of catalyst, also can carry out suitable EGR control, compensates the reduction of NOx catalyzer for the exhaust gas purification rate of NOx well.
On above-mentioned engine exhaust emission control device, preferred above-mentioned EGR control unit, the amount of the exhaust of the above-mentioned motor that utilizes above-mentioned EGR unit to reflux is restricted to the set upper limit amount that is less than or equal to, to become the excess air ratio that can suppress the smog of discharging from above-mentioned motor.
As previously mentioned, when corresponding for the reduction of the exhaust gas purification rate of NOx with the NOx catalyzer, when the EGR gas flow was increased, the excess air ratio in the cylinder excessively reduced, and may become the main cause that increases from the smog of motor discharge.But under the situation of the Exhaust gas purifying device that constitutes motor in this manner, the EGR control unit is controlled to be the EGR gas flow below the set upper limit amount in order to suppress smog.Its result can prevent in advance that smog increases with the reduction of the excess air ratio in the cylinder.
Description of drawings
Fig. 1 is the overall structure figure of the Exhaust gas purifying device of the motor that the present invention relates to of expression.
Fig. 2 is that expression is used for the block diagram that purification ratio compensates the processing sequence of the ECU that controls.
Fig. 3 is expression air inlet O 2Concentration and NOx reduce the performance plot of the relation of coefficient.
Embodiment
Below, with reference to the accompanying drawings, the Exhaust gas purifying device of the motor that relates to for an embodiment of the invention at length describes.
Fig. 1 is the overall structure figure of the engine exhaust emission control device of expression present embodiment.Motor 1 constitutes the array 6 cylinder diesel engine of lift-launch on vehicle.On each cylinder of motor 1 Fuelinjection nozzle 2 is set, each Fuelinjection nozzle 2 is supplied with pressurized fuel from public oily rail 3, driving valve with the corresponding timing of the operating condition of motor 1, to the in-cylinder injection fuel of each cylinder.
Air inlet side at motor 1 is installed intake manifold 4.With inlet air pathway 5 that intake manifold 4 is connected in, from upstream side, be provided with air-strainer 6, turbosupercharger 7 compressor 7a, interstage cooler 8, utilize actuator 9 by the intake-air throttle valve 9 of driven for opening and closing.In addition, at the exhaust side of motor 1 gas exhaust manifold 10 is installed.Gas exhaust manifold 10 is via with the turbine 7b of the turbosupercharger 7 of above-mentioned compressor 7a mechanical link and be connected with exhaust passageway 11.In exhaust passageway 11, be provided with and utilize actuator 12a by the exhaust shutter 12 of driven for opening and closing.
In the operation process of motor 1, be imported into the air inlet in the inlet air pathway 5 via air-strainer 6, utilize the compressor 7a pressurization of turbosupercharger 7.Air inlet after the pressurization is via interstage cooler 8, intake-air throttle valve 9, intake manifold 4 and be dispensed to each cylinder, and in the intake stroke of each cylinder, is imported in the cylinder.Fuel in predetermined timing from Fuelinjection nozzle 2 to in-cylinder injection, and near compression top dead center the igniting, the burning.Exhaust after the burning after driving turbo machine 7b via gas exhaust manifold 10 rotations, is discharged to the outside via exhaust passageway 11.
Intake manifold 4 utilizes EGR path (EGR unit) 17 to be connected with gas exhaust manifold 10.In EGR path 17, be provided with and utilize actuator 18a by EGR valve of driven for opening and closing (EGR unit) and cooler for recycled exhaust gas 19.In the operation process of motor 1, corresponding with the aperture of EGR valve 18, the part in the exhaust from gas exhaust manifold 10 sides as the EGR gas backstreaming to intake manifold 4 sides.
In above-mentioned exhaust passageway 11 Exhaust gas purifying device of the present invention is set, Exhaust gas purifying device is housed in upstream side housing 31 and the downstream side housing 32.Basically, two housings 31,32 and not shown baffler interconnect via pipeline 33a～33c, constitute exhaust passageway 11 by these parts.If begin to illustrate successively from the upstream side of exhaust passageway 11, then be arranged on the exhaust shutter 12 in downstream side of the turbo machine 7b of turbosupercharger 7, be connected with upstream side housing 31 via the 1st pipeline 33a.Upstream side housing 31 is connected with downstream side housing 32 via the 2nd pipeline 33b.Downstream side housing 32 is connected with baffler via the 3rd pipeline 33c, and the rear end of baffler is to atmosphere opening.
Upstream side housing 31 and downstream side housing 32 all form the general cylindrical shape shape, extend upward in the front and back of vehicle.In upstream side housing 31, accommodate leading portion oxidation catalyst 34 at the upstream side of inside, simultaneously, accommodate the DPF (diesel particulate filter) 35 of wall-flow type in the downstream side.DPF35 has the function of the particulate in the exhaust of catching.Upstream side housing 31 is from the collecting position of DPF35, keeps identical sectional shape and extends to the rear.Its result, the downstream side of the DPF35 in upstream side housing 31 forms the space, below this space is called spraying explosion chamber 36.
In spraying explosion chamber 36, be provided for making exhaust to produce the impeller assembly 37 of eddy current.The impeller assembly 37 of present embodiment is made of the upright a plurality of blade 37a that are provided with on the inner circle wall of upstream side housing 31.Each blade 37a of impeller assembly 37 changes the predetermined angular direction and disposes with respect to the flow direction of exhaust, and thus, the central axis that produces with upstream side body 31 is the eddy current at center.
On the periphery wall of upstream side housing 31, the mode with the downstream side that is positioned at impeller assembly 37 is provided with jet blower 38.Jet blower 38 constitutes, can be with the urea water injection of illustrated holding vessel pressurized delivered never in spraying explosion chamber 36.The injection direction of jet blower 38 is set at, and with respect to the flow direction quadrature of exhaust, simultaneously, is set at the central part of directed upstream side body 31.In addition, between impeller assembly 37 and jet blower 38 temperature transducer 39 is set, temperature transducer 39 detects the delivery temperature Tnzl in the spraying explosion chamber 36.
In downstream side housing 32, accommodate SCR catalyzer (selective reduction type NOx catalyzer) 40 at the upstream side of inside, simultaneously, accommodate back segment oxidation catalyst 41 in the downstream side.As described later, SCR catalyzer 40 has NOx in the selective reduction exhaust and the function of purifying exhaust gas.
At the indoor ECU (electronic control unit) 51 that is provided with of car, it has not shown input output unit, is used for the storage device (ROM, RAM) of storage control program or control corresponding diagram etc., central processing unit (CPU), timer etc.Input side at ECU 51 connects temperature transducer 39, rotation speed sensor 52, air inlet O 2Various sensors such as sensor (oxygen concentration detection unit) 53, catalyst-temperature pickup 54, accelerator sensor 55, NOx sensor 56.
The rotational speed Ne of rotation speed sensor 52 detection of engine 1.Air inlet O 2Sensor 53 is configured in the intake manifold 4, detects the O of the air inlet of supplying with in each cylinder 2Concentration.The temperature that catalyst-temperature pickup 54 detects SCR catalyzer 40 is SCR temperature T cat.Accelerator sensor 55 detects the operation amount Acc of accelerator pedal.The discharge capacity that NOx sensor 56 detects from the NOx of SCR catalyzer 40.
In addition, at the outlet side of ECU51, connect the various device such as each actuator 9a, 12a, 18a, Fuelinjection nozzle 2, jet blower 38 of above-mentioned intake-air throttle valve 9, exhaust shutter 12, EGR valve 18.
For example, ECU 51 is according to engine rotary speed Ne or accelerator operation amount Acc, and corresponding diagram is according to the rules set fuel injection amount Q, and simultaneously, according to this fuel injection amount Q and engine rotary speed Ne, corresponding diagram is according to the rules set fuel injection timing IT.ECU51 is according to these fuel injection amounts Q and fuel injection timing IT, and the driving of control Fuelinjection nozzle 2 makes fuel to each in-cylinder injection, makes motor 1 running.
In addition, ECU 51 based on fuel emitted dose Q and engine rotary speed Ne, corresponding diagram is according to the rules differentiated EGR execution area and non-execution area.In the EGR execution area, according to the target EGR amount of setting according to corresponding diagram, actuator 18a, the 9a of ECU 51 control EGR valves 18 and intake-air throttle valve 9.By this EGR control, in the EGR execution area, by opening the control of EGR valve 18, make exhaust in the gas exhaust manifold 10 via EGR path 17, reflux in intake manifold 4 as EGR gas, simultaneously, improve negative pressure in the intake manifold 4, promote the backflow of EGR gas by the control of closing intake-air throttle valve 9.Its result by the backflow of measuring corresponding EGR gas with above-mentioned target EGR, suppresses the combustion temperature in the cylinder, reduces the NOx discharge capacity of motor 1.
In addition, ECU 51 is according to by temperature transducer 39 detected delivery temperature Tnzl etc., and control is from the emitted dose of the urea water of jet blower 38.The urea water of spraying is utilized the water vapour in exhaust gas heat and the exhaust and is added water decomposition, generates ammonia (NH 3).In SCR catalyzer 40, by using this ammonia, the NOx in the exhaust can be reduced to harmless N2 as reducing agent, carry out exhaust gas purification.At this moment, remaining ammonia utilizes back segment oxidation catalyst 41 to remove from exhaust.
As stating in the explanation that relates in background technique, because the environmental conditions of the cold area that the vehicle driving condition of the traffic congestion in urban district etc. etc. or outside air temperature are lower etc., the temperature that SCR catalyzer 40 occurs is lower than active temperature, for the rapid problem that reduces of the exhaust gas purification rate of NOx.Therefore, in the present embodiment, following countermeasure is proposed: when SCR catalyzer 40 reduces for the exhaust gas purification rate of NOx because temperature reduces,, compensate of the reduction of SCR catalyzer 40 for the exhaust gas purification rate of NOx by the corresponding EGR amount of control with this reduction amount.Below, according to Fig. 2 the purification ratio compensation control of being carried out by ECU 51 for this countermeasure is described.Fig. 2 is that expression is used for the block diagram that purification ratio compensates the processing sequence of the ECU 51 that controls.
As the structure that is used to carry out purification ratio compensation control, ECU 51 has desired value calculating part 61 and EGR/ air inlet restriction control device (EGR control unit) 62.Desired value calculating part 61 plays following effect: calculate and to reduce required EGR with the exhaust gas purification rate that is compensation SCR catalyzer 40 and measure relevant air inlet O 2The desired value of concentration.In addition, EGR/ air inlet restriction control device 62 plays following effect: the driving of each actuator 9a, 18a of control intake-air throttle valve 9 and EGR valve 18, and with the air inlet O of reality 2Concentration is adjusted into target air inlet O 2Concentration.In addition, EGR/ air inlet control device 62 also carries out the EGR control based on execution area and the non-execution area of above-mentioned EGR.
At first, describe for desired value calculating part 61.NOx discharge capacity calculating part 71 is according to engine rotary speed Ne and fuel injection amount Q, corresponding diagram according to the rules, calculate the NOx that discharges from the cylinder of motor 1 amount, be the NOx discharge capacity of so-called motor output.It is that prerequisite is set that the NOx of the motor 1 of this corresponding diagram when not carrying out EGR discharges characteristic,, obtains the NOx discharge capacity when because of the EGR gas backstreaming velocity of combustion not being suppressed here.
In addition, NOx reduces coefficient calculations portion (NOx reduces coefficient calculation unit) 72, according to the air inlet O that supplies with in each cylinder 2Concentration (air inlet O 2Concentration), corresponding diagram is according to the rules calculated NOx minimizing COEFFICIENT K.So-called NOx reduces COEFFICIENT K, and being expression makes the index of the state that the NOx discharge capacity of motor output reduces because of the EGR gas backstreaming.The characteristic of expression corresponding diagram in Fig. 3.As shown in Figure 3, the air inlet O shown in the transverse axis 2Concentration changes corresponding to the amount (EGR amount) of the EGR gas that is back to the air inlet side from exhaust side.That is to say, when EGR does not carry out (EGR amount=0), air inlet O 2Concentration be suitable with common composition of atmosphere 21%, it is maximum value 1.0 that NOx reduces coefficient.From this state, the air inlet O along with the increase of EGR amount 2Concentration reduce, with it accordingly, the production rate of the NOx owing to suppressed velocity of combustion in the cylinder reduces.Its result, NOx reduces coefficient and becomes less value.
In addition, air inlet O 2Concentration also can be calculated according to the operating condition of motor 1 except utilizing sensor.For this method, because known, do not describe in detail, but for example can obtain according to following method.That is, at first by the amount of calculating such as the new tolerance of obtaining according to the output of not shown pneumatic sensor to the EGR gas of each cylinder supply.Then, the based on fuel emitted dose is inferred residual O in this EGR gas 2Concentration.According to the remaining O that obtains like this 2O in concentration and the new gas 2Concentration can be inferred the O of the air inlet of supplying with in cylinder 2Concentration.
The NOx discharge capacity of trying to achieve by NOx discharge capacity calculating part 71, and reduce the NOx that coefficient calculations portion 72 tries to achieve by NOx and reduce COEFFICIENT K, be input to multiplying section 73 and multiply each other.The NOx discharge capacity that will be multiply by NOx minimizing COEFFICIENT K by the NOx discharge capacity that NOx discharge capacity calculating part 71 is tried to achieve and obtain, expression has reflected the NOx discharge capacity of the motor output of EGR executing state.
Infer purification ratio calculating part (the exhaust gas purification rate is inferred the unit) 74, according to SCR temperature T cat and SV ratio, corresponding diagram is according to the rules obtained the infer exhaust gas purification rate η of SCR catalyzer 40 for NOx.SCR temperature T cat and SV ratio are the essential condition that SCR catalyzer 40 is exerted an influence for the exhaust gas purification rate of NOx.That is to say that SCR temperature T cat is low more, SCR catalyzer 40 is low more for the exhaust gas purification rate of NOx.In addition, so-called SV ratio is the extraction flow of motor 1 and the ratio of the capacity of SCR catalyzer 40.Because swept volume is many more with respect to the catalyzer capacity, then the air displacement that the per unit capacity is handled in SCR catalyzer 40 increases more, so SCR catalyzer 40 reduces more for the exhaust gas purification rate of NOx.Though the catalyzer capacity is known in advance, extraction flow changes corresponding to the operating condition of motor 1.Therefore, with the new gas flow that utilizes pneumatic sensor etc. for example to obtain and fuel injection amount addition and calculate extraction flow, obtain the SV ratio according to this extraction flow and catalyzer capacity.
The NOx discharge capacity of above-mentioned motor output and infer exhaust gas purification rate η is transfused to multiplying section 75 and multiplies each other each other.The NOx discharge capacity of motor output multiply by the NOx discharge capacity of inferring after the exhaust gas purification rate η, and expression is flow through SCR catalyzer 40 and is discharged into NOx discharge capacity the atmosphere from tailpipe, hereinafter to be referred as inferring the NOx discharge capacity.
Infer the NOx discharge capacity with utilizing NOx sensor 5 detected actual NOx discharge capacitys, be transfused to the coefficient calculations portion (degradation judgment unit) 76 that worsens.Worsen coefficient calculations portion 76 according to these NOx discharge capacitys, calculate the deterioration COEFFICIENT K cat of SCR catalyzer 40.In above-mentioned a series of computing, be prerequisite there not to be the SCR catalyzer 40 that worsens, calculation NOx discharge capacity.On the other hand, the degradation mode of the SCR catalyzer 40 that 56 reflections of NOx sensor are current detects the actual NOx discharge capacity that has more than or equal to the value of inferring the NOx discharge capacity.Thus, deterioration coefficient calculations portion 76 by the interior relatively variation of these two values during certain, worsens COEFFICIENT K cat and derive, as the index of the degradation mode that reflects current SCR catalyzer 40.Worsening COEFFICIENT K cat is 1.0 when SCR catalyzer 40 does not worsen, and reduces along with the development of degradation mode.
Utilize to worsen the deterioration COEFFICIENT K cat that coefficient calculations portion 76 calculates and be transfused to multiplying section 77, and multiply each other from the exhaust gas purification rate of the inferring η that infers purification ratio calculating part 74.Value after multiplying each other, can be considered as reflecting current SCR catalyzer degradation mode, SCR catalyzer 40 is for the presumed value of the exhaust gas purification rate of NOx.
Target purge rate calculating part (target exhaust purification ratio computing unit) 78, according to engine rotary speed Ne and fuel injection amount Q, corresponding diagram is according to the rules calculated the target exhaust purification ratio η tgt of SCR catalyzer 40 for NOx.This target exhaust purification ratio η tgt is the exhaust gas purification rate of SCR catalyzer 40 of the best of each operation range of motor 1, for example, on the basis of the various important documents of considering smog discharge capacity etc., try to achieve as in each operation range for the desired value of the exhaust gas purification rate of the best of NOx, wherein, the discharge characteristic of smog discharge capacity is opposite with NOx's, and when considering, makes them be in compromise relation.
Target exhaust purification ratio η tgt and multiply by in multiplying section 77 worsens the exhaust gas purification rate of the inferring η behind the COEFFICIENT K cat, is transfused to deviation ratio calculating part 79.Deviation ratio calculating part 79 is as the ratio of two values and calculate purification ratio deviation ratio R (=η/η tgt).From multiplying section 77 output infer NOx purification ratio η, as mentioned above, be that the temperature that reflected current SCR catalyzer 40 reduces or the actual exhaust air purification ratio for NOx of deterioration etc.Therefore, must have and be lower than the value that optimum value is target exhaust purification ratio η tgt.Its result, target exhaust purification ratio η tgt is purification ratio deviation ratio R with the ratio of inferring exhaust gas purification rate η, can be considered as representing make SCR catalyzer 40 to improve the index of much degree for the exhaust gas purification rate of NOx.
The purification ratio deviation ratio R that calculates is transfused to multiplying section 80, reduces on the COEFFICIENT K at the NOx that is calculated by NOx minimizing coefficient calculations portion 72 and multiply by purification ratio deviation ratio R, calculates target NOx and reduces COEFFICIENT K tgt.That is to say that target NOx reduces COEFFICIENT K tgt, reduce COEFFICIENT K based on current NOx, corresponding with raising amount for the exhaust gas purification rate of necessity of NOx, calculate as the value after the correction.Reduce COEFFICIENT K tgt, target air inlet O according to this target NOx 2Concentration calculating part (aimed oxygen concn computing unit) 81 according to corresponding diagram shown in Figure 3, to reduce the opposite order of coefficient calculations portion 72 with above-mentioned NOx, reduces COEFFICIENT K tgt according to target NOx and obtains target air inlet O 2Concentration.
More than be to calculate the processing that single portion 61 carries out by the desired value of ECU 51.The target air inlet O that calculates 2Concentration is and by air inlet O 2Sensor 53 detected actual air inlet O 2Concentration is transfused to EGR/ air inlet restriction control device 62 together.EGR/ air inlet restriction control device 62 is carried out based target air inlet O by the driving of each actuator 9a, 18a of control intake-air throttle valve 9 and EGR valve 18 2The air inlet O of concentration 2The feedback control of concentration.
As mentioned above, the desired value calculating part 61 of ECU 51 and EGR/ air inlet restriction control device 62 are carried out purification ratio compensation control.Thus, when since for example the temperature of the traffic congestion in urban district or the SCR catalyzer 40 that produces because of outside air temperature reduction etc. reduce, or because the deterioration of the SCR catalyzer 40 that long-term work causes etc., and when SCR catalyzer 40 is reduced for the exhaust gas purification rate of NOx, by the control that the EGR that carries out via following process measures, compensation is for the reduction of the exhaust gas purification rate of NOx.
When the temperature of SCR catalyzer 40 reduces, will infer NOx purification ratio η corresponding to the reduction of SCR temperature T cat and be set in the minimizing side by inferring purification ratio calculating part 74.On the other hand, when SCR catalyzer 40 worsened, the reduction along with the deterioration COEFFICIENT K cat that is calculated by deterioration coefficient calculations portion 76 was set in the minimizing side by be multiply by deterioration COEFFICIENT K cat by multiplying section 77 with exhaust gas purification rate η.Its result in either case, all utilizes deviation ratio to calculate 79 purification ratio deviation ratio R is set in the minimizing side.
In multiplying section 80,, multiply by and current air inlet O by as the above-mentioned purification ratio deviation ratio R that reduces side that is set in 2The corresponding NOx of concentration reduces COEFFICIENT K, and the target NOx that calculates littler value reduces COEFFICIENT K tgt.Then, target air inlet O 2 Concentration calculating part 81 is obtained with target NOx and is reduced the corresponding target air inlet of COEFFICIENT K tgt O 2Concentration.EGR/ air inlet restriction control device 62 is by according to this target air inlet O 2Concentration is carried out the control of EGR amount, with the air inlet O of reality 2Concentration is controlled to be target O 2Concentration.
For example, as shown in Figure 3, at current air inlet O 2When concentration was controlled as A, if carry out purification ratio compensation control for the reduction of the exhaust gas purification rate of NOx corresponding to SCR catalyzer 40, then the NOx of this moment reduced COEFFICIENT K and is corrected as target NOx according to purification ratio deviation ratio R and reduces COEFFICIENT K tgt.Tgt is corresponding with this target NOx minimizing COEFFICIENT K, target air inlet O 2Concentration is set to B, is used for the control of EGR amount.Its result, corresponding to the reduction amount of SCR catalyzer 40 for the exhaust gas purification rate of NOx, the EGR gas flow that is back to the air inlet side of motor 1 increases.Therefore, by the inhibition of the combustion temperature in the cylinder, can reduce NOx discharge capacity from cylinder.Thereby,, or under the deterioration status of development of SCR40, also can realize sufficient exhaust purification performance for NOx even be under the situation of low-temperature region in the temperature of SCR catalyzer 40.
In addition, because utilize existing EGR path 17 and EGR valve 18, compensation SCR catalyzer 40 is for the reduction of the exhaust gas purification rate of NOx, so as the structure of Exhaust gas purifying device, it there is no different with existing structure.Therefore, needn't make the structure complicated of Exhaust gas purifying device can obtain above action effect.
All be converted under the situation of EGR amount in the amount that will reduce, the possibility that is caused a fog and increased by the excessive increase of EGR amount because of operation range is also arranged because of the exhaust gas purification rate that the temperature reduction of SCR catalyzer 40 etc. causes for NOx.Therefore, for example also can set air inlet O for each operation range of motor 1 2The lower limit of concentration, and according to the upper limit of this lower limit restriction EGR gas flow.With this air inlet O 2The lower limit of concentration is applied under the situation of above-mentioned mode of execution, and EGR/ air inlet restriction control device 62 is according to air inlet O 2The lower limit of concentration, restriction EGR gas flow is carried out the control of EGR amount so that it is no more than the set upper limit amount.In addition, air inlet O 2The restriction of concentration, because further the restriction with the excess air ratio of motor 1 is relevant, so in the motor of the form of carrying out EGR control according to the corresponding target gas excess rate of setting with operating condition, also can be to target gas excess rate preset lower limit.In the above-described embodiment, using this air inlet O 2Under the situation of the lower limit of concentration, or under the situation of the lower limit of application target excess air ratio, EGR/ air inlet restriction control device 62 is according to air inlet O 2The lower limit of the lower limit of concentration or target gas excess rate is carried out the control of EGR amount, so that the capacity of reflux of EGR gas is no more than the set upper limit amount.According to these control, on the basis of the effect of above-mentioned mode of execution,, can obtain to prevent in advance the effect that smog that the excessive reduction because of the excess air ratio in the cylinder causes increases by the EGR gas flow being restricted to the set upper limit amount that is less than or equal to.
More than finish the explanation of mode of execution, but mode of the present invention is not limited to this mode of execution.For example, in the above-described embodiment, applying the present invention to diesel engine 1 is the Exhaust gas purifying device of object.But application of the present invention is not limited thereto, and for example, also can apply the present invention to petrol engine.In addition, in EGR/ air inlet restriction control device 62, control the EGR amount by the aperture of intake-air throttle valve 9 and EGR valve 18.Also can increase the aperture control of exhaust shutter 12 on this basis, when EGR controls,, row pressure be increased by EGR/ air inlet restriction control device 62 control exhaust shutters 12.

Claims (5)

1. the Exhaust gas purifying device of a motor, it has: selective reduction type NOx catalyzer (40), it is configured in the exhaust passageway (11) of motor (1), with ammonia as reducing agent, the NOx that selective reduction contains in the exhaust of above-mentioned motor (1); And EGR unit (17,18), it makes the air inlet side of the exhaust gas recirculation of above-mentioned motor (1) to above-mentioned motor (1),
It is characterized in that also having:
The exhaust gas purification rate is inferred unit (74), and it infers the exhaust gas purification rate of above-mentioned NOx catalyzer (40) for NOx;
Target exhaust purification ratio computing unit (78), it calculates the target exhaust purification ratio for NOx according to the operating condition of above-mentioned motor (1); And
Control unit (51), it controls above-mentioned EGR unit (17,18), to compensate above-mentioned decrease of inferring the exhaust gas purification rate with respect to above-mentioned target exhaust purification ratio.
2. the Exhaust gas purifying device of motor as claimed in claim 1 is characterized in that,
Above-mentioned control unit (51) will utilize the amount of the exhaust of the above-mentioned motor (1) that above-mentioned EGR unit (17,18) refluxes, and be restricted to the set upper limit amount that is less than or equal to, to become the excess air ratio that can suppress the smog of discharging from above-mentioned motor (1).
3. the Exhaust gas purifying device of motor as claimed in claim 1 is characterized in that,
Also have oxygen concentration detection unit (53), it detects the oxygen concentration of the air inlet of supplying with in the cylinder of described motor,
Above-mentioned control unit (51) has:
NOx reduces coefficient calculation unit (72), its basis is with respect to the NOx formation characteristic in the cylinder of the above-mentioned motor (1) of the oxygen concentration of above-mentioned air inlet, calculate and reduce coefficient, as the index of the minimizing state that is illustrated in the NOx production rate in the cylinder that utilizes above-mentioned motor (1) under the detected oxygen concentration of above-mentioned oxygen concentration detection unit (53);
Aimed oxygen concn computing unit (81), it is according to inferred the exhaust gas purification rate of inferring out unit (74) ratio with above-mentioned target exhaust purification ratio by above-mentioned exhaust gas purification rate, proofread and correct above-mentioned NOx and reduce coefficient, according to above-mentioned NOx formation characteristic, above-mentioned NOx after calculating and proofreading and correct reduces the corresponding oxygen concentration of coefficient, as aimed oxygen concn; And
EGR control unit (62), it controls above-mentioned EGR unit (17,18) according to the aimed oxygen concn that is calculated by above-mentioned aimed oxygen concn computing unit (81).
4. the Exhaust gas purifying device of motor as claimed in claim 3 is characterized in that,
Also have degradation judgment unit (76), it judges the degradation mode of above-mentioned NOx catalyzer (40),
Above-mentioned aimed oxygen concn computing unit (81), degradation mode according to the above-mentioned NOx catalyzer that determines by above-mentioned degradation judgment unit (76), correction is inferred the exhaust gas purification rate that infer out unit (74) by above-mentioned exhaust gas purification rate, and the exhaust gas purification rate of inferring after proofreading and correct is used for the correction that above-mentioned NOx reduces coefficient.
5. the Exhaust gas purifying device of motor as claimed in claim 3 is characterized in that,
Above-mentioned EGR control unit (62), to utilize the amount of the exhaust of the above-mentioned motor (1) that above-mentioned EGR unit (17,18) refluxes to be restricted to the set upper limit amount that is less than or equal to, to become the excess air ratio that can suppress the smog of discharging from above-mentioned motor (1).
CN2008101864782A 2007-12-20 2008-12-19 Exhaust purification apparatus for engine Expired - Fee Related CN101463770B (en)

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